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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b92133867553c0d879cb03596f109569c544365bd3605569a4435af5c4ba7f3' 
  AND token = '2nb5qqjcP1qtyK3cS0ksT8//VV/g6DPsoisxurj59MQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}